What is the typical shape of a struvite stone?

• A. Coffin
• B. Square
• C. Round
• D. Oblong

Answer: (A)

Struvite stones are typically described as having a characteristic shape that resembles a coffin, particularly because they are often large and can have irregular surfaces. This distinct morphology is influenced by their composition, which primarily includes magnesium ammonium phosphate. They are frequently associated with urinary tract infections caused by urease-producing organisms, which can lead to the formation of these larger stones that fit the coffin-like description. The unique formation process and chemical environment in which struvite stones develop contribute to their specific shape, setting them apart from other types of kidney stones.